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在空心工件上滚压螺纹时,即使壁的刚性相当大,但由于沿工作长度刚性不一致,也会在长度l上沿外径产生锥度(D-D_1)/l(图a),因而加工出不完整的螺纹.为避免这种情况,在滚压螺纹前在毛坯沿长度l上做出倒锥(图b),即使(D_3-D_1)=(D-D_1),这样在全长上即可滚压出合格的沿外径完整的圆柱螺纹.例如当径向液压材料为钢45空心工件(内孔直径64mm)M72×1.56h螺纹时,在螺纹长度l=30mm上产生0.3mm的锥度(由于刚性低和工件长).在毛坯上做出同样的倒锥后就能滚压出合格的螺纹,但外径不可避免地有不大的中凹(在0.1mm内),这是由于靠近端面刚性有所增大,在倒锥和径向滚压条件下不可能纵向车削金属.
When the thread is rolled on a hollow workpiece, even if the rigidity of the wall is quite large, the taper (D-D_1) / l along the outer diameter along the length l is produced due to the inconsistent rigidity along the working length Incomplete thread. To avoid this, before the thread rolling in the blank along the length l make a reverse cone (Figure b), even if (D_3-D_1) = (D-D_1), so that in the whole length of For example, when the radial hydraulic material is a steel 45 hollow workpiece (bore diameter 64mm) M72 × 1.56h thread, there is a 0.3mm taper on the thread length l = 30mm (Due to low rigidity and long workpieces.) Qualified threads can be rolled out with the same inverted taper on the blank, but the outer diameter inevitably has a slight undercut (within 0.1 mm) due to As the rigidity increases near the end face, it is not possible to turn the metal in the longitudinal direction under inverted cone and radial rolling conditions.